JPS626161B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piston top clearance measuring device for measuring the gap between the cylinder end face of a reciprocating compressor and the top dead center of the piston.

A conventional piston top clearance measuring device has a structure as shown in Fig. 1, and is rotated by hand using a collar d provided on a shaft c built into a frame b held by a holder a. If so, the piston e moves back and forth in the direction shown by the arrow. The piston e is moved forward and backward while the limit plate gauge f is applied to the end face of the cylinder g, and whether or not it is within the limit of the limit plate gauge f is visually determined. In addition, as shown in FIG. 2, using a measuring device such as a dial gauge h, measure the dimension between the gauge stylus i and the end surface h' of the dial gauge h in advance. The conventional method was to abut the end surface g' of the cylinder g, move the piston e back and forth, and measure the top clearance of the piston from the dimensions at that time. However, the time required for measurement increases. Additionally, the use of limit plate gauges requires skill and is difficult to measure without experience. Further, when using a measuring device such as a dial gauge, it is necessary to measure the entire surface of the piston at the top dead center, and individual differences are likely to occur. Another drawback is that it is difficult to automate the measurement using the current method.

This invention was made in consideration of the above circumstances, and its purpose is to provide a gauge that is in contact with the end face of a cylinder in accordance with the forward and backward direction of the piston as an object to be measured, and a piston that is located at the center of the gauge. The object of the present invention is to provide a measuring device which measures the top clearance of a piston by moving the piston forward and backward by providing a measuring point of a measuring device that comes into contact with the end surface of the piston so that it can move forward and backward.

An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 3, reference numeral 1 denotes a holder. A frame 2 is placed on the upper surface of this holder 1, and a measured object 5 in which a piston 4 is movably fitted into a cylinder 3 is mounted on the upper surface of this frame 2. It is designed to be removably installed. The frame 2 also has a pin 6 and a through hole 7 on the top surface, and a shaft 8 on the bottom surface.
A collar 9 is placed thereon. and,
The collar 9 rotates around the shaft 8 as a central axis,
The eccentric rotation of the pin 6 causes the piston 4 to move forward and backward in the direction of the arrow. On the other hand, a substrate 10 is placed above the holder 1.
It is supported by an air cylinder 11 provided above so as to be movable up and down. Then, the substrate 10
An air cylinder 12 is attached to the air cylinder 12, and by operating this air cylinder 12, a shaft 1 provided on the side of this air cylinder 12 is activated.
It is designed to rotate 3. A rotating head 15 is provided below the shaft 13 via an arm 14. The above rotating head 1
A pin 16 that fits into the through hole 7 provided in the collar 9 is provided at the tip of the collar 5, and is always urged downward by a spring 17 provided at the top of the pin 16. Therefore, when the air cylinder 12 is operated, the pin 16 rotates around the shaft 13, and the piston 4 moves forward and backward within the cylinder 3 as shown by the arrow.
A bearing 18 is attached to the lower surface of the substrate 10. The center line of this bearing 18 is the piston 4.
A housing pipe 20 that coincides with the center line 19 of is fitted so as to be movable along the center line 19. By operating the air cylinder 21 provided on the substrate 10, the lever 22 is rotated about the fulcrum 23, and the housing pipe 20 is moved toward the object to be measured 5. A buffer spring 25 is installed between the force point 24 below the lever 22 and the housing pipe 20. Above housing pipe 2
A gauge 27 having a recess 26 is supported by a universal bearing 28 having a spherical sliding surface on the side facing the object 5 to be measured. It has become possible to make certain movements. A piston 4 is placed in the recess 26 of the gauge 27.
A probe 29 is fitted to follow the movement of the probe. A spring 30 is attached to the probe 29 so as to always urge the tip end surface 29a of the probe 29 on the piston side toward the end surface of the piston 4. Also,
A dial gauge 32 having a pointer 31 is provided on the opposite side of the measuring element 29. A measuring element 33 is provided on the piston side of the dial gauge 32 so as to be in close contact with the measuring element 29 at all times. Further, as shown in FIG. 4, at the rear end of the gauge 27 supported by the universal bearing 28, a radial arm 34 is provided toward the inner wall of the housing pipe 20. A pin 35 is rotatably supported at the tip of the arm 34, and is supported by a spring 36 for keeping the tip of the pin 35 in constant contact with the inner wall of the housing pipe 20. It is biased in the radial direction. A balance mechanism 37 is configured by pressing the pins 35 against the inner wall of the housing pipe 20 to maintain a constant axis of the gauge 27 supported by the universal bearing 28. The balance mechanism 37 allows the axis of the gauge 27 to follow the direction of the unbalanced load even if an unbalanced load is applied to the gauge 27. Therefore, when the gauge 27 is pressed against the end surface of the cylinder 3, it is possible to prevent contact errors due to the perpendicular machining accuracy of the end surface of the cylinder 3.

Next, the operation of this invention configured as described above will be explained.

First, when the air cylinder 11 is actuated and the substrate 10 is lowered, the gauge 27 is positioned on the same line as the piston 4 and faces the end surface of the cylinder 3. At this time, the pin 16 rides on the collar 9,
As shown in FIG. 3, the spring 17 is pushed up. Next, when the air cylinder 21 is activated, the lever 22 rotates around the fulcrum 23,
The housing pipe 20 moves within the bearing 18 toward the piston 4 against the elasticity of the spring 25. The gauge 27 attached to the housing pipe 20 also moves, and the end face of the gauge 27 comes into contact with the end face of the cylinder 3. At this time, the buffer spring 25 absorbs the impact upon contact. Furthermore, the universal bearing 28 allows the gauge 27 to move freely, so that the end face of the gauge 27 comes into close contact with the end face of the cylinder 3. The end surface of this cylinder 3 becomes the reference surface for measurement. Next, when the air cylinder 12 operates, the shaft 13 rotates, and the pin 16 slides on the collar 9 of the shaft 8 with the shaft 13 as the center. The through hole 7 provided in the brim 9
When the pin 16 is moved to this point, the pin 16 is pushed down by the spring 17 and falls into the above-mentioned through hole 7. pin 1
Since the piston 6 moves further, the shaft 8 also rotates accordingly, and the piston 4 moves forward and backward. When the air cylinder 12 returns to the initial position, the pin 16 also moves and returns to the initial position, but the shaft 8 also rotates, so the piston 4 moves forward and backward. The piston 4 moves forward and backward once or twice with each reciprocation of the air cylinder 12. As described above, when the piston 4 moves toward the top dead center, it hits the contact point 29. Since the tip 29a of the probe 29 is smaller than the diameter of the piston 4, it enters the inside of the cylinder 3 and waits. When the piston 4 moves, the probe 29 also moves accordingly. The measuring stylus 33 is always in close contact with the measuring stylus 29 and moves according to the movement of the measuring stylus 29, and the pointer 31 of the dial gauge 32 moves, and when the piston 4 reaches the top dead center, the pointer 31 indicates the highest value. If you know the scale position of the pointer 31 of the dial gauge 32 when the surface of the gauge 27 that is brought into close contact with the cylinder 3 and the surface of the gauge head 33 that is in contact with the piston 4 are on the same plane, then the end surface of the cylinder 3 and The size of the top clearance between the top dead center of the piston 4 and the top dead center can be known.

When the measurement is completed, the air cylinder 21 returns to its initial position. Then, the air cylinder 11 returns to its initial position and returns to its initial state.

In the above embodiment, the top clearance of the piston 4 was measured by visually observing the value indicated by the pointer 31 of the dial gauge 32. It is also possible to digitally display the clearance or display pass/fail.

As explained above, in order to measure the top clearance of an object to be measured in which a piston is fitted into a cylinder, there is a gauge that faces the object to be measured and is in contact with the end surface of the cylinder, and a gauge that is in constant contact with the end surface of the piston. and a measuring device having a measuring point that is always in close contact with the other end of the measuring point, the gauge is supported by a universal bearing so that the end face of the gauge is always in close contact with the end face of the cylinder, and the balance mechanism allows the gauge and the measuring point to Also, by always holding the measuring point of the measuring device at a constant position, there is an effect that highly accurate measurement can be carried out efficiently.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional measuring device, FIG. 2 is a front view of another conventional device, FIG. 3 is a front view of an embodiment of the present invention, and FIG. 4 is a diagram showing the inside of this housing pipe. FIG. 5, which is an enlarged sectional view, is an explanatory diagram showing the positional relationship between the air cylinder that drives the piston and the shaft. DESCRIPTION OF SYMBOLS 1... Holder, 3... Cylinder, 4... Piston, 5... Measured object, 8... Shaft, 9... Collar, 12... Air cylinder, 15... Rotating head, 16... Pin, 17...Spring, 20...
...Housing pipe, 25...Buffer spring,
27...Gauge, 28...Universal bearing, 2
9, 33... Measuring head, 30... Spring, 34
...Arm, 35...Pin, 36...Spring, 37...Balance mechanism.

Claims (1)

[Claims] 1. The shaft has a flange on the end surface, and a pin is provided on the flange to protrude eccentrically from the shaft,
In a measuring device for measuring the top clearance of the piston of an object to be measured, which has a piston that can freely reciprocate in a cylinder on this pin, the shaft of the object to be measured is rotatably inserted and the collar portion is placed. A holding base, an air cylinder provided above the holding base, a pin that works in conjunction with the air cylinder and fits into a flange hole provided in the flange at the front end, and this pin is always pressed against the flange. A piston drive mechanism consisting of a rotating head equipped with a spring, a housing pipe that faces the end surfaces of the cylinder and piston of the object to be measured and is movable toward and away from the cylinder via a buffer mechanism, A gauge that is supported inside via a universal bearing and has a contact surface at its tip that comes into close contact with the end face of the cylinder, and a pin provided on the gauge that is biased in the radial direction and elastically comes into contact with the inner wall of the housing pipe. and a balance mechanism equipped with a plurality of radial arms that hold the axis of the gauge in a fixed position, and a balance mechanism that is fitted in the center of the gauge so as to be able to move forward and backward relative to the end surface of the piston, and is always supported by a spring. A measuring element that is urged toward the end surface of the piston and whose tip surface is in surface contact with the end surface of the piston, and a measuring device that has a measuring element that is always in close contact with the rear end of the measuring element and indicates the amount of movement of the piston. A piston top clearance measuring device characterized by comprising: